23) When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

24) In radial cams, the follower moves

25) The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.

26) According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

27) In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)